Optimal selection of machining direction for three-axis milling of sculptured parts |
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Authors: | Yann Quinsat Laurent Sabourin |
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Affiliation: | (1) Department of Machines, Mechanisms and Systems, LaMI IFMA/Université Blaise Pascal, Campus de CLERMONT-FERRAND, Les Cézeaux, BP 265, 63175, Aubière Cedex, France |
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Abstract: | In the field of free form surface machining, CAM software allows management of various modes of tool-path generation (zig-zag, spiral, z-level, parallel plan, iso-planar, etc.) leaning on the geometry of the surface to be machined. Various machining strategies can be used for the same shape. Nevertheless the choice of a machining strategy remains an expert field. Indeed there are no precise rules to facilitate the necessary parameter choice for tool-path computation from analysis of the numerical model of a part and the quality requirements. The objective of this paper is to provide a method to assist in the choice of the machining direction for parallel plane milling of sculptured parts. The influence of the tool-path on final quality according to the intrinsic geometrical characteristics of the latter (curves, orientation) was studied. Directional beams are introduced and defined from the local surface parameter. Finally, a methodology to optimize machining time while guaranteeing a high level of quality was developed and applied to examples. |
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Keywords: | Machining strategy Surface roughness Finishing process Sculptured parts Three-axis milling |
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